AD9545 datasheet(124/157 Pages) AD

124 / 157 page

AD9545

Data Sheet

Rev. A | Page 124 of 157

fields. When programming these bit fields, use the temperature

format shown in Figure 96.

If the output value of the temperature sensor falls outside the

specified limits, the temperature alarm bit in Bit D0 of

Logic 0). The temperature alarm bit allows the user to check the

status of the threshold detector in real time.

The temperature alarm bit is the source of the temperature

warning bit in Bit D4 of Register 0x300C. The temperature

warning bit allows the user to set up automatic notification of a

temperature threshold detection event via the IRQ mechanism

(see the Interrupt Request (IRQ) section).

EXTERNAL TEMPERATURE SOURCE

The external temperature source constitutes a temperature

value programmed into the external temperature bit field in

internal temperature sensor properly scales temperature values

for use by the internal temperature compensation functional

blocks automatically, the user must scale the external

temperature values properly.

The external temperature bit field represents temperature in

units of °C × 2−7 (see Figure 96). This format yields a

temperature range of ±256°C with 0.0078°C resolution.

To program an external temperature value of 95°C,

External Temperature = 95/2−7

= 12,160

= 0x2F80 (hexadecimal)

AD9545 Datasheet(PDF) 124 Page - Analog Devices